一种适用于高速移动环境的LDPC译码算法  

A LDPC Decoding Algorithm for the Mobile Environment of High Speed

作　　者：杜乐[1] 郑娟毅[1] 李永[1] 吴玮[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,西安710121

出　　处：《光通信研究》2017年第4期66-69,共4页Study on Optical Communications

基　　金：国家自然科学基金资助项目(11401469);陕西省自然科学基金资助项目(2014JQ1030)

摘　　要：为了降低译码算法复杂度、提高信道传送质量,提出一种改进型低密度奇偶校验译码算法。该算法是以多径瑞利衰落信道仿真模型作为高速移动环境下的信道模型,采用有理函数逼近的思想,降低每次循环时校验节点的运算量,从而降低信道译码算法复杂度。在MATLAB环境下对该算法进行了仿真验证,结果表明,相对于对数似然比置信传播译码算法,改进后的低密度奇偶校验译码算法具有较好的译码性能,更能有效降低译码的复杂度。因此改进译码算法应用在高速移动环境中,可以提高信道传输的质量和效率。In order to reduce the complexity of algorithm and improve the quality of channel transmission, a modified LDPCdecoding algorithm is proposed in this paper. The algorithm is used in high speed mobile environment where multipath Ray-leigh fading channel model is chosen considering the frequency selective deterministic scenario. At the same time, Taylor func-tion approximation is adopted to reduce the amount of inspection node in cycling step, as well as the complexity of decoding.Simulation results show that, compared with BP LLR decoding algorithm, the modified LDPC decoding algorithm has betterdecoding performance, and can effectively reduce the decoding complexity. Therefore, the modified LDPC decoding algorithmcan be applied in the high speed mobile environment, which can improve the quality and efficiency of channel transmission.

关 键 词：低密度奇偶校验码 对数似然比置信传播译码算法 改进型BP译码算法 复杂度 

分 类 号：TN911.22[电子电信—通信与信息系统]